[Slater]

Anyone have any experience with this OTG DAC?
 
http://www.ggmm.com/a1-headphone-amplifier-p00025p1.html
http://www.gearbest.com/headphone-accessories/pp_608684.html
 
Specs:
 
DAC chip: WM8533
Playback performance: 24bit/192KHz                                     
Frequency:  20Hz-20KHz
Sensitivity: >103dB                                                                    
Distortion: <0.013%
Power current: 600mA max                                                    
Output: 1460mV
Impedance: 16Ohm~150Ohm
 
If I get a good enough phone (Galaxy 7 for example), would this be unnecessary?
 
I would only be using it for 16-32ohm IEMs, so I'm less confident in it's claims of an amplifier and more interested in it's capability/reliability as a DAC.
 
I have an Xduoo X3 and FiiO E12 amp for more serious portable listening. Just looking for something for use with a phone when I don't feel like lugging around the dedicated stuff.
 
Thanks,
- Slater

 

[Adide]

Hey @Slater .

Became interested in this ultra portable dac/amp after @Viber 's recent good review.
Unfortunately it seems to have a pretty high output impedance (~5 Ohm) as can be seen here so with most IEM's having ~16 Ohm or less one can expect side effects ranging from sound coloring to total crapifying (as with KZ ZS5 which notoriously needs a very low output impedance source as its own impedance is ~5 Ohm).
So right now I'd say it's more or less either a gamble or a matching exercise (depending on your headset impedance but even most over-ear are ~32 Ohm so...) and personally I'll stick with my more cumbersome but also more potent AQDF Black (0.5 Ohm).
Cheers.